英语听力 学英语,练听力,上听力课堂! 注册 登录
> 在线听力 > 英语初级听力 > 科普英语 Earth and Sky >  第19篇

Earth and Sky科普英语:Electric Fish 发电鱼

所属教程:科普英语 Earth and Sky

浏览:

手机版
扫描二维码方便学习和分享
https://online2.tingclass.net/lesson/shi0529/0008/8879/19.mp3
https://image.tingclass.net/statics/js/2012
Electric Fish 发电鱼

One way that Harold Zakon and his team find fish to study is to put electrical detectors into the bottom of murky streams in Venezuela. This works because certain fish emit pulses of electricity. Discover electric fish -- on today's Earth and Sky.

DB: This is Earth and Sky. You won't feel a shock. In fact, it takes a special instrument to detect the electric pulses made by a group of fish known as "weakly electric fish".

JB: Unlike eels, which zap their prey with electricity, weakly electric fish use electricity to navigate and locate objects -- and other fish. Harold Zakon studies them at the University of Texas at Austin.

Harold Zakon: ... each species has a different pattern, each of the sexes within a species and each individual. If they approached another fish, they could detect its discharge and determine what species, sex and individual it was. If it was a member of their own species, they might even recognize it.

DB: The electrical pulses of these fish might provide some insight into the workings of the human brain. That's because human brains also work electrically. But electrical discharges made by fish are easier to study than the electricity in the brain.

Harold Zakon: You always have to crack the brain and stick an electrode in. Here, the animals just emit this signal, and we can watch these changes and infer what's going on in the membranes of their cells, just from their behavior.

JB: There's more about electric fish and human brains at today's show at earthsky.org. Thanks to the National Science Foundation -- where discoveries begin. We're Block and Byrd for Earth and Sky.

用户搜索

疯狂英语 英语语法 新概念英语 走遍美国 四级听力 英语音标 英语入门 发音 美语 四级 新东方 七年级 赖世雄 zero是什么意思上海市同润蓝美俊庭(公寓)英语学习交流群

网站推荐

英语翻译英语应急口语8000句听歌学英语英语学习方法

  • 频道推荐
  • |
  • 全站推荐
  • 推荐下载
  • 网站推荐